Update kernel to builds 8860983 am: 8cb7fbbfd4 am: 84a61e48bf am: 1293afe7d6

Original change: https://android-review.googlesource.com/c/kernel/prebuilts/4.19/arm64/+/2166803

Change-Id: I1270e39b0f14e21e384b0387fa107918011daf2a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>